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FFmpeg/libavcodec/dvdsubdec.c

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  1. /*

  2.  * DVD subtitle decoding

  3.  * Copyright (c) 2005 Fabrice Bellard

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "avcodec.h"

  23. #include "get_bits.h"

  24. #include "internal.h"

  25. 

  26. #include "libavutil/attributes.h"

  27. #include "libavutil/colorspace.h"

  28. #include "libavutil/opt.h"

  29. #include "libavutil/imgutils.h"

  30. #include "libavutil/avstring.h"

  31. #include "libavutil/bswap.h"

  32. 

  33. typedef struct DVDSubContext

  34. {

  35.   AVClass *class;

  36.   uint32_t palette[16];

  37.   char    *palette_str;

  38.   char    *ifo_str;

  39.   int      has_palette;

  40.   uint8_t  colormap[4];

  41.   uint8_t  alpha[256];

  42.   uint8_t *buf;

  43.   int      buf_size;

  44.   int      forced_subs_only;

  45. #ifdef DEBUG

  46.   int sub_id;

  47. #endif

  48. } DVDSubContext;

  49. 

  50. static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)

  51. {

  52.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  53.     uint8_t r, g, b;

  54.     int i, y, cb, cr;

  55.     int r_add, g_add, b_add;

  56. 

  57.     for (i = num_values; i > 0; i--) {

  58.         y = *ycbcr++;

  59.         cr = *ycbcr++;

  60.         cb = *ycbcr++;

  61.         YUV_TO_RGB1_CCIR(cb, cr);

  62.         YUV_TO_RGB2_CCIR(r, g, b, y);

  63.         *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;

  64.     }

  65. }

  66. 

  67. static int decode_run_2bit(GetBitContext *gb, int *color)

  68. {

  69.     unsigned int v, t;

  70. 

  71.     v = 0;

  72.     for (t = 1; v < t && t <= 0x40; t <<= 2)

  73.         v = (v << 4) | get_bits(gb, 4);

  74.     *color = v & 3;

  75.     if (v < 4) { /* Code for fill rest of line */

  76.         return INT_MAX;

  77.     }

  78.     return v >> 2;

  79. }

  80. 

  81. static int decode_run_8bit(GetBitContext *gb, int *color)

  82. {

  83.     int len;

  84.     int has_run = get_bits1(gb);

  85.     if (get_bits1(gb))

  86.         *color = get_bits(gb, 8);

  87.     else

  88.         *color = get_bits(gb, 2);

  89.     if (has_run) {

  90.         if (get_bits1(gb)) {

  91.             len = get_bits(gb, 7);

  92.             if (len == 0)

  93.                 len = INT_MAX;

  94.             else

  95.                 len += 9;

  96.         } else

  97.             len = get_bits(gb, 3) + 2;

  98.     } else

  99.         len = 1;

  100.     return len;

  101. }

  102. 

  103. static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,

  104.                       const uint8_t *buf, int start, int buf_size, int is_8bit)

  105. {

  106.     GetBitContext gb;

  107.     int bit_len;

  108.     int x, y, len, color;

  109.     uint8_t *d;

  110. 

  111.     if (start >= buf_size)

  112.         return -1;

  113. 

  114.     bit_len = (buf_size - start) * 8;

  115.     init_get_bits(&gb, buf + start, bit_len);

  116. 

  117.     x = 0;

  118.     y = 0;

  119.     d = bitmap;

  120.     for(;;) {

  121.         if (get_bits_count(&gb) > bit_len)

  122.             return -1;

  123.         if (is_8bit)

  124.             len = decode_run_8bit(&gb, &color);

  125.         else

  126.             len = decode_run_2bit(&gb, &color);

  127.         len = FFMIN(len, w - x);

  128.         memset(d + x, color, len);

  129.         x += len;

  130.         if (x >= w) {

  131.             y++;

  132.             if (y >= h)

  133.                 break;

  134.             d += linesize;

  135.             x = 0;

  136.             /* byte align */

  137.             align_get_bits(&gb);

  138.         }

  139.     }

  140.     return 0;

  141. }

  142. 

  143. static void guess_palette(DVDSubContext* ctx,

  144.                           uint32_t *rgba_palette,

  145.                           uint32_t subtitle_color)

  146. {

  147.     static const uint8_t level_map[4][4] = {

  148.         // this configuration (full range, lowest to highest) in tests

  149.         // seemed most common, so assume this

  150.         {0xff},

  151.         {0x00, 0xff},

  152.         {0x00, 0x80, 0xff},

  153.         {0x00, 0x55, 0xaa, 0xff},

  154.     };

  155.     uint8_t color_used[16] = { 0 };

  156.     int nb_opaque_colors, i, level, j, r, g, b;

  157.     uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;

  158. 

  159.     if(ctx->has_palette) {

  160.         for(i = 0; i < 4; i++)

  161.             rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)

  162.                               | ((alpha[i] * 17U) << 24);

  163.         return;

  164.     }

  165. 

  166.     for(i = 0; i < 4; i++)

  167.         rgba_palette[i] = 0;

  168. 

  169.     nb_opaque_colors = 0;

  170.     for(i = 0; i < 4; i++) {

  171.         if (alpha[i] != 0 && !color_used[colormap[i]]) {

  172.             color_used[colormap[i]] = 1;

  173.             nb_opaque_colors++;

  174.         }

  175.     }

  176. 

  177.     if (nb_opaque_colors == 0)

  178.         return;

  179. 

  180.     j = 0;

  181.     memset(color_used, 0, 16);

  182.     for(i = 0; i < 4; i++) {

  183.         if (alpha[i] != 0) {

  184.             if (!color_used[colormap[i]])  {

  185.                 level = level_map[nb_opaque_colors][j];

  186.                 r = (((subtitle_color >> 16) & 0xff) * level) >> 8;

  187.                 g = (((subtitle_color >> 8) & 0xff) * level) >> 8;

  188.                 b = (((subtitle_color >> 0) & 0xff) * level) >> 8;

  189.                 rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);

  190.                 color_used[colormap[i]] = (i + 1);

  191.                 j++;

  192.             } else {

  193.                 rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |

  194.                                     ((alpha[i] * 17) << 24);

  195.             }

  196.         }

  197.     }

  198. }

  199. 

  200. static void reset_rects(AVSubtitle *sub_header)

  201. {

  202.     int i;

  203. 

  204.     if (sub_header->rects) {

  205.         for (i = 0; i < sub_header->num_rects; i++) {

  206.             av_freep(&sub_header->rects[i]->pict.data[0]);

  207.             av_freep(&sub_header->rects[i]->pict.data[1]);

  208.             av_freep(&sub_header->rects[i]);

  209.         }

  210.         av_freep(&sub_header->rects);

  211.         sub_header->num_rects = 0;

  212.     }

  213. }

  214. 

  215. #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))

  216. 

  217. static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,

  218.                                 const uint8_t *buf, int buf_size)

  219. {

  220.     int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;

  221.     int big_offsets, offset_size, is_8bit = 0;

  222.     const uint8_t *yuv_palette = NULL;

  223.     uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;

  224.     int date;

  225.     int i;

  226.     int is_menu = 0;

  227. 

  228.     if (buf_size < 10)

  229.         return -1;

  230. 

  231.     if (AV_RB16(buf) == 0) {   /* HD subpicture with 4-byte offsets */

  232.         big_offsets = 1;

  233.         offset_size = 4;

  234.         cmd_pos = 6;

  235.     } else {

  236.         big_offsets = 0;

  237.         offset_size = 2;

  238.         cmd_pos = 2;

  239.     }

  240. 

  241.     cmd_pos = READ_OFFSET(buf + cmd_pos);

  242. 

  243.     if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size)

  244.         return AVERROR(EAGAIN);

  245. 

  246.     while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {

  247.         date = AV_RB16(buf + cmd_pos);

  248.         next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);

  249.         av_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",

  250.                 cmd_pos, next_cmd_pos, date);

  251.         pos = cmd_pos + 2 + offset_size;

  252.         offset1 = -1;

  253.         offset2 = -1;

  254.         x1 = y1 = x2 = y2 = 0;

  255.         while (pos < buf_size) {

  256.             cmd = buf[pos++];

  257.             av_dlog(NULL, "cmd=%02x\n", cmd);

  258.             switch(cmd) {

  259.             case 0x00:

  260.                 /* menu subpicture */

  261.                 is_menu = 1;

  262.                 break;

  263.             case 0x01:

  264.                 /* set start date */

  265.                 sub_header->start_display_time = (date << 10) / 90;

  266.                 break;

  267.             case 0x02:

  268.                 /* set end date */

  269.                 sub_header->end_display_time = (date << 10) / 90;

  270.                 break;

  271.             case 0x03:

  272.                 /* set colormap */

  273.                 if ((buf_size - pos) < 2)

  274.                     goto fail;

  275.                 colormap[3] = buf[pos] >> 4;

  276.                 colormap[2] = buf[pos] & 0x0f;

  277.                 colormap[1] = buf[pos + 1] >> 4;

  278.                 colormap[0] = buf[pos + 1] & 0x0f;

  279.                 pos += 2;

  280.                 break;

  281.             case 0x04:

  282.                 /* set alpha */

  283.                 if ((buf_size - pos) < 2)

  284.                     goto fail;

  285.                 alpha[3] = buf[pos] >> 4;

  286.                 alpha[2] = buf[pos] & 0x0f;

  287.                 alpha[1] = buf[pos + 1] >> 4;

  288.                 alpha[0] = buf[pos + 1] & 0x0f;

  289.                 pos += 2;

  290.             av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);

  291.                 break;

  292.             case 0x05:

  293.             case 0x85:

  294.                 if ((buf_size - pos) < 6)

  295.                     goto fail;

  296.                 x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);

  297.                 x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];

  298.                 y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);

  299.                 y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];

  300.                 if (cmd & 0x80)

  301.                     is_8bit = 1;

  302.                 av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);

  303.                 pos += 6;

  304.                 break;

  305.             case 0x06:

  306.                 if ((buf_size - pos) < 4)

  307.                     goto fail;

  308.                 offset1 = AV_RB16(buf + pos);

  309.                 offset2 = AV_RB16(buf + pos + 2);

  310.                 av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);

  311.                 pos += 4;

  312.                 break;

  313.             case 0x86:

  314.                 if ((buf_size - pos) < 8)

  315.                     goto fail;

  316.                 offset1 = AV_RB32(buf + pos);

  317.                 offset2 = AV_RB32(buf + pos + 4);

  318.                 av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);

  319.                 pos += 8;

  320.                 break;

  321. 

  322.             case 0x83:

  323.                 /* HD set palette */

  324.                 if ((buf_size - pos) < 768)

  325.                     goto fail;

  326.                 yuv_palette = buf + pos;

  327.                 pos += 768;

  328.                 break;

  329.             case 0x84:

  330.                 /* HD set contrast (alpha) */

  331.                 if ((buf_size - pos) < 256)

  332.                     goto fail;

  333.                 for (i = 0; i < 256; i++)

  334.                     alpha[i] = 0xFF - buf[pos+i];

  335.                 pos += 256;

  336.                 break;

  337. 

  338.             case 0xff:

  339.                 goto the_end;

  340.             default:

  341.                 av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);

  342.                 goto the_end;

  343.             }

  344.         }

  345.     the_end:

  346.         if (offset1 >= 0) {

  347.             int w, h;

  348.             uint8_t *bitmap;

  349. 

  350.             /* decode the bitmap */

  351.             w = x2 - x1 + 1;

  352.             if (w < 0)

  353.                 w = 0;

  354.             h = y2 - y1 + 1;

  355.             if (h < 0)

  356.                 h = 0;

  357.             if (w > 0 && h > 0) {

  358.                 reset_rects(sub_header);

  359. 

  360.                 bitmap = av_malloc(w * h);

  361.                 sub_header->rects = av_mallocz(sizeof(*sub_header->rects));

  362.                 sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));

  363.                 sub_header->num_rects = 1;

  364.                 sub_header->rects[0]->pict.data[0] = bitmap;

  365.                 if (decode_rle(bitmap, w * 2, w, (h + 1) / 2,

  366.                                buf, offset1, buf_size, is_8bit) < 0)

  367.                     goto fail;

  368.                 if (decode_rle(bitmap + w, w * 2, w, h / 2,

  369.                                buf, offset2, buf_size, is_8bit) < 0)

  370.                     goto fail;

  371.                 sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);

  372.                 if (is_8bit) {

  373.                     if (!yuv_palette)

  374.                         goto fail;

  375.                     sub_header->rects[0]->nb_colors = 256;

  376.                     yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);

  377.                 } else {

  378.                     sub_header->rects[0]->nb_colors = 4;

  379.                     guess_palette(ctx, (uint32_t*)sub_header->rects[0]->pict.data[1],

  380.                                   0xffff00);

  381.                 }

  382.                 sub_header->rects[0]->x = x1;

  383.                 sub_header->rects[0]->y = y1;

  384.                 sub_header->rects[0]->w = w;

  385.                 sub_header->rects[0]->h = h;

  386.                 sub_header->rects[0]->type = SUBTITLE_BITMAP;

  387.                 sub_header->rects[0]->pict.linesize[0] = w;

  388.                 sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;

  389.             }

  390.         }

  391.         if (next_cmd_pos < cmd_pos) {

  392.             av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n");

  393.             break;

  394.         }

  395.         if (next_cmd_pos == cmd_pos)

  396.             break;

  397.         cmd_pos = next_cmd_pos;

  398.     }

  399.     if (sub_header->num_rects > 0)

  400.         return is_menu;

  401.  fail:

  402.     reset_rects(sub_header);

  403.     return -1;

  404. }

  405. 

  406. static int is_transp(const uint8_t *buf, int pitch, int n,

  407.                      const uint8_t *transp_color)

  408. {

  409.     int i;

  410.     for(i = 0; i < n; i++) {

  411.         if (!transp_color[*buf])

  412.             return 0;

  413.         buf += pitch;

  414.     }

  415.     return 1;

  416. }

  417. 

  418. /* return 0 if empty rectangle, 1 if non empty */

  419. static int find_smallest_bounding_rectangle(AVSubtitle *s)

  420. {

  421.     uint8_t transp_color[256] = { 0 };

  422.     int y1, y2, x1, x2, y, w, h, i;

  423.     uint8_t *bitmap;

  424. 

  425.     if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)

  426.         return 0;

  427. 

  428.     for(i = 0; i < s->rects[0]->nb_colors; i++) {

  429.         if ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0)

  430.             transp_color[i] = 1;

  431.     }

  432.     y1 = 0;

  433.     while (y1 < s->rects[0]->h && is_transp(s->rects[0]->pict.data[0] + y1 * s->rects[0]->pict.linesize[0],

  434.                                   1, s->rects[0]->w, transp_color))

  435.         y1++;

  436.     if (y1 == s->rects[0]->h) {

  437.         av_freep(&s->rects[0]->pict.data[0]);

  438.         s->rects[0]->w = s->rects[0]->h = 0;

  439.         return 0;

  440.     }

  441. 

  442.     y2 = s->rects[0]->h - 1;

  443.     while (y2 > 0 && is_transp(s->rects[0]->pict.data[0] + y2 * s->rects[0]->pict.linesize[0], 1,

  444.                                s->rects[0]->w, transp_color))

  445.         y2--;

  446.     x1 = 0;

  447.     while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->pict.data[0] + x1, s->rects[0]->pict.linesize[0],

  448.                                         s->rects[0]->h, transp_color))

  449.         x1++;

  450.     x2 = s->rects[0]->w - 1;

  451.     while (x2 > 0 && is_transp(s->rects[0]->pict.data[0] + x2, s->rects[0]->pict.linesize[0], s->rects[0]->h,

  452.                                   transp_color))

  453.         x2--;

  454.     w = x2 - x1 + 1;

  455.     h = y2 - y1 + 1;

  456.     bitmap = av_malloc(w * h);

  457.     if (!bitmap)

  458.         return 1;

  459.     for(y = 0; y < h; y++) {

  460.         memcpy(bitmap + w * y, s->rects[0]->pict.data[0] + x1 + (y1 + y) * s->rects[0]->pict.linesize[0], w);

  461.     }

  462.     av_freep(&s->rects[0]->pict.data[0]);

  463.     s->rects[0]->pict.data[0] = bitmap;

  464.     s->rects[0]->pict.linesize[0] = w;

  465.     s->rects[0]->w = w;

  466.     s->rects[0]->h = h;

  467.     s->rects[0]->x += x1;

  468.     s->rects[0]->y += y1;

  469.     return 1;

  470. }

  471. 

  472. #ifdef DEBUG

  473. #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)

  474. static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,

  475.                      uint32_t *rgba_palette)

  476. {

  477.     int x, y, alpha;

  478.     uint32_t v;

  479.     int back[3] = {0, 255, 0};  /* green background */

  480.     FILE *f;

  481. 

  482.     f = fopen(filename, "w");

  483.     if (!f) {

  484.         perror(filename);

  485.         return;

  486.     }

  487.     fprintf(f, "P6\n"

  488.             "%d %d\n"

  489.             "%d\n",

  490.             w, h, 255);

  491.     for(y = 0; y < h; y++) {

  492.         for(x = 0; x < w; x++) {

  493.             v = rgba_palette[bitmap[y * w + x]];

  494.             alpha = v >> 24;

  495.             putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);

  496.             putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);

  497.             putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);

  498.         }

  499.     }

  500.     fclose(f);

  501. }

  502. #endif

  503. 

  504. static int append_to_cached_buf(AVCodecContext *avctx,

  505.                                 const uint8_t *buf, int buf_size)

  506. {

  507.     DVDSubContext *ctx = avctx->priv_data;

  508. 

  509.     if (ctx->buf_size > 0xffff - buf_size) {

  510.         av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "

  511.                "too large SPU packets aborted.\n");

  512.         av_freep(&ctx->buf);

  513.         return AVERROR_INVALIDDATA;

  514.     }

  515.     ctx->buf = av_realloc(ctx->buf, ctx->buf_size + buf_size);

  516.     if (!ctx->buf)

  517.         return AVERROR(ENOMEM);

  518.     memcpy(ctx->buf + ctx->buf_size, buf, buf_size);

  519.     ctx->buf_size += buf_size;

  520.     return 0;

  521. }

  522. 

  523. static int dvdsub_decode(AVCodecContext *avctx,

  524.                          void *data, int *data_size,

  525.                          AVPacket *avpkt)

  526. {

  527.     DVDSubContext *ctx = avctx->priv_data;

  528.     const uint8_t *buf = avpkt->data;

  529.     int buf_size = avpkt->size;

  530.     AVSubtitle *sub = data;

  531.     int is_menu;

  532. 

  533.     if (ctx->buf) {

  534.         int ret = append_to_cached_buf(avctx, buf, buf_size);

  535.         if (ret < 0) {

  536.             *data_size = 0;

  537.             return ret;

  538.         }

  539.         buf = ctx->buf;

  540.         buf_size = ctx->buf_size;

  541.     }

  542. 

  543.     is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);

  544.     if (is_menu == AVERROR(EAGAIN)) {

  545.         *data_size = 0;

  546.         return append_to_cached_buf(avctx, buf, buf_size);

  547.     }

  548. 

  549.     if (is_menu < 0) {

  550.     no_subtitle:

  551.         reset_rects(sub);

  552.         *data_size = 0;

  553. 

  554.         return buf_size;

  555.     }

  556.     if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)

  557.         goto no_subtitle;

  558. 

  559.     if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))

  560.         goto no_subtitle;

  561. 

  562. #if defined(DEBUG)

  563.     {

  564.     char ppm_name[32];

  565. 

  566.     snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);

  567.     av_dlog(NULL, "start=%d ms end =%d ms\n",

  568.             sub->start_display_time,

  569.             sub->end_display_time);

  570.     ppm_save(ppm_name, sub->rects[0]->pict.data[0],

  571.              sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->pict.data[1]);

  572.     }

  573. #endif

  574. 

  575.     av_freep(&ctx->buf);

  576.     ctx->buf_size = 0;

  577.     *data_size = 1;

  578.     return buf_size;

  579. }

  580. 

  581. static void parse_palette(DVDSubContext *ctx, char *p)

  582. {

  583.     int i;

  584. 

  585.     ctx->has_palette = 1;

  586.     for(i=0;i<16;i++) {

  587.         ctx->palette[i] = strtoul(p, &p, 16);

  588.         while(*p == ',' || av_isspace(*p))

  589.             p++;

  590.     }

  591. }

  592. 

  593. static int parse_ifo_palette(DVDSubContext *ctx, char *p)

  594. {

  595.     FILE *ifo;

  596.     char ifostr[12];

  597.     uint32_t sp_pgci, pgci, off_pgc, pgc;

  598.     uint8_t r, g, b, yuv[65], *buf;

  599.     int i, y, cb, cr, r_add, g_add, b_add;

  600.     int ret = 0;

  601.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  602. 

  603.     ctx->has_palette = 0;

  604.     if ((ifo = fopen(p, "r")) == NULL) {

  605.         av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));

  606.         return AVERROR_EOF;

  607.     }

  608.     if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {

  609.         av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);

  610.         ret = AVERROR_INVALIDDATA;

  611.         goto end;

  612.     }

  613.     if (fseek(ifo, 0xCC, SEEK_SET) == -1) {

  614.         ret = AVERROR(errno);

  615.         goto end;

  616.     }

  617.     if (fread(&sp_pgci, 4, 1, ifo) == 1) {

  618.         pgci = av_be2ne32(sp_pgci) * 2048;

  619.         if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {

  620.             ret = AVERROR(errno);

  621.             goto end;

  622.         }

  623.         if (fread(&off_pgc, 4, 1, ifo) == 1) {

  624.             pgc = pgci + av_be2ne32(off_pgc);

  625.             if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {

  626.                 ret = AVERROR(errno);

  627.                 goto end;

  628.             }

  629.             if (fread(yuv, 64, 1, ifo) == 1) {

  630.                 buf = yuv;

  631.                 for(i=0; i<16; i++) {

  632.                     y  = *++buf;

  633.                     cr = *++buf;

  634.                     cb = *++buf;

  635.                     YUV_TO_RGB1_CCIR(cb, cr);

  636.                     YUV_TO_RGB2_CCIR(r, g, b, y);

  637.                     ctx->palette[i] = (r << 16) + (g << 8) + b;

  638.                     buf++;

  639.                 }

  640.                 ctx->has_palette = 1;

  641.             }

  642.         }

  643.     }

  644.     if (ctx->has_palette == 0) {

  645.         av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);

  646.         ret = AVERROR_INVALIDDATA;

  647.     }

  648. end:

  649.     fclose(ifo);

  650.     return ret;

  651. }

  652. 

  653. static int dvdsub_parse_extradata(AVCodecContext *avctx)

  654. {

  655.     DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;

  656.     char *dataorig, *data;

  657.     int ret = 1;

  658. 

  659.     if (!avctx->extradata || !avctx->extradata_size)

  660.         return 1;

  661. 

  662.     dataorig = data = av_malloc(avctx->extradata_size+1);

  663.     if (!data)

  664.         return AVERROR(ENOMEM);

  665.     memcpy(data, avctx->extradata, avctx->extradata_size);

  666.     data[avctx->extradata_size] = '\0';

  667. 

  668.     for(;;) {

  669.         int pos = strcspn(data, "\n\r");

  670.         if (pos==0 && *data==0)

  671.             break;

  672. 

  673.         if (strncmp("palette:", data, 8) == 0) {

  674.             parse_palette(ctx, data + 8);

  675.         } else if (strncmp("size:", data, 5) == 0) {

  676.             int w, h;

  677.             if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {

  678.                ret = ff_set_dimensions(avctx, w, h);

  679.                if (ret < 0)

  680.                    goto fail;

  681.             }

  682.         }

  683. 

  684.         data += pos;

  685.         data += strspn(data, "\n\r");

  686.     }

  687. 

  688. fail:

  689.     av_free(dataorig);

  690.     return ret;

  691. }

  692. 

  693. static av_cold int dvdsub_init(AVCodecContext *avctx)

  694. {

  695.     DVDSubContext *ctx = avctx->priv_data;

  696.     int ret;

  697. 

  698.     if ((ret = dvdsub_parse_extradata(avctx)) < 0)

  699.         return ret;

  700. 

  701.     if (ctx->ifo_str)

  702.         parse_ifo_palette(ctx, ctx->ifo_str);

  703.     if (ctx->palette_str)

  704.         parse_palette(ctx, ctx->palette_str);

  705.     if (ctx->has_palette) {

  706.         int i;

  707.         av_log(avctx, AV_LOG_DEBUG, "palette:");

  708.         for(i=0;i<16;i++)

  709.             av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);

  710.         av_log(avctx, AV_LOG_DEBUG, "\n");

  711.     }

  712. 

  713.     return 1;

  714. }

  715. 

  716. static av_cold int dvdsub_close(AVCodecContext *avctx)

  717. {

  718.     DVDSubContext *ctx = avctx->priv_data;

  719.     av_freep(&ctx->buf);

  720.     ctx->buf_size = 0;

  721.     return 0;

  722. }

  723. 

  724. #define OFFSET(field) offsetof(DVDSubContext, field)

  725. #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

  726. static const AVOption options[] = {

  727.     { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },

  728.     { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },

  729.     { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},

  730.     { NULL }

  731. };

  732. static const AVClass dvdsub_class = {

  733.     .class_name = "dvdsubdec",

  734.     .item_name  = av_default_item_name,

  735.     .option     = options,

  736.     .version    = LIBAVUTIL_VERSION_INT,

  737. };

  738. 

  739. AVCodec ff_dvdsub_decoder = {

  740.     .name           = "dvdsub",

  741.     .long_name      = NULL_IF_CONFIG_SMALL("DVD subtitles"),

  742.     .type           = AVMEDIA_TYPE_SUBTITLE,

  743.     .id             = AV_CODEC_ID_DVD_SUBTITLE,

  744.     .priv_data_size = sizeof(DVDSubContext),

  745.     .init           = dvdsub_init,

  746.     .decode         = dvdsub_decode,

  747.     .close          = dvdsub_close,

  748.     .priv_class     = &dvdsub_class,

  749. };